On 03/31/2010 07:20 AM, Daniel J Blueman wrote:
Talking of expensive, I see latencytop show>16000ms latency for writing pages when I have a workload that does large buffered I/O to an otherwise uncongested server. The gigabit network is saturated, and reads often stall for 1000-4000ms (!). Client has the default 16 TCP request slots, and server has 8 nfsds - the server is far from disk or processor-saturated. I'll see if there is any useful debugging I can get about this.
That latency is pretty much guaranteed to be due to a long RPC backlog queue on the client. Bumping the size of the slot table to 128 and increasing the number of NFSD threads may help.
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